Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (5,235)	$ 528	$ (5,653)
Other comprehensive (loss) income, net of tax: Foreign currency translation (loss) income	(61)	42	13
Total comprehensive (loss) income	(5,296)	570	(5,640)
Less: Comprehensive income (loss) attributable to noncontrolling interest	1	(1)	1
Comprehensive (loss) income, attributable to Aehr Test Systems	$ (5,297)	$ 571	$ (5,641)